Worshippers were said to have been leaving the mosque as the gunmen launched their attack, although a source claimed they were not the intended victims.
One attacker was reportedly carrying a handgun, while the other man was said to have been armed with a rifle.
A search for the two suspects is currently underway police have confirmed.
The incident comes weeks after a terrorist attack near Finsbury Park Mosque in north London which left one man dead and another eight injured.
France is on high security alert following a series of militant attacks in recent years.
Reuters was unable to immediately confirm the report, which cited a judicial source as saying police are “not at all treating it as terrorist related” and suspected instead a dispute between youths.